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MÆRSK OLIE OG GAS MÆRSK OLIE OG GAS ASAS – – GYMNASIE OPGAVE GYMNASIE OPGAVE - 2008- 2008
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Velkommen til olie industrien – MAERSK OLIE OG GAS AS
Oooooohh…! Jeg kan se, at du har en vigtig
rolle, at spille i olie industrien!
Se den positive side! I 2008 vil din rådne krop
koste 11 kr. literen på tanken!
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The Geology Case – now it is your turn!
MY OWN LITTLE OILFIELD
THE MOLO FIELD
OPGAVE
OPGAVE – beregn olie mængden i et reservoir
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Gross Rock Volume is:
Volume of rock containing our reservoir
STOIIP (Stock Tank Oil Initially In Place) or
GIIP (Gas Initially In Place) is:
Amount of hydrocarbons present in our reservoir
RESERVES are:
Hydrocarbons we can produce (given present conditions)
OPGAVE – Baggrundsinformation 1
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Recovery Factor is depending on:
• Reservoir Quality & Conditions
• Oil and Gas Type
• Number of Production Wells and Type (Cost)
• Production Method (Enhanced Recovery)
RESERVES = [STOIIP] · [Recovery Factor]
OPGAVE – Baggrundsinformation 2
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YOUR FACTS:
1) We have 2 seismic profiles across the reservoir
2) The MOLO-1 well penetrated the top of the reservoir at a depth of XXXX feet
3) An oil-water contact was found in MOLO-1 at a depth of XXXX feet
4) The average porosity (Φ) was found to be 0.XXX (XX.X vol.%)
5) The penetrated reservoir is reduced by interspaced non-reservoir rock → N/G ratio of 0.90 (90 vol.%)
6) The average water saturation (Sw) is 0.XX (XX vol.%)
7) The Formation Volume Factor (FVF) is 1.2 (the reduction in oil volume due to loss of gas content when moving from reservoir pressure and temperature to surface conditions)
8) The Recovery Factor (RF) is estimated to be 0.25 (i.e. 25 % of the STOIIP will be produced to surface).
OPGAVE – Baggrundsinformation 3
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YOUR TASK:
1) Calculate the Gross Rock Volume (GRV)
2) Calculate Stock Tank Oil Initially In Place (STOIIP)
3) Calculate the Reserves
OPGAVE: My Own Little Oilfield 1
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OPGAVE: My Own Little Oilfield 2
EAST
SOUTH
NORTHMOLO-1 well
Seismic ProfilesSeismic Profiles
WEST
Top of Reservoir
1000
feet
5700
6000
6300
6600
6900
7200
7500
7800
NOTE – feet!
MOLO-1 well
Oil-Water Contact / Transition Zone
OPGAVE: My Own Little Oilfield 3
NOTE – meter!
MOLO-1
A wireline log showing the porosity and hydrocarbon saturation profile from the well
Approximately 180 ft of chalk oil-reservoir
h 60 meters
GRapi0 150
TVDSSFT7700 6700
LLDOHMM0.2 200
LLSOHMM0.2 200
MSFLOHMM0.2 200
TNPHCFCF0.6 0
DRHOG/C30.75 -0.25
RHOBG/C31.7 2.7
DTCO1US/F140 40
DEPTHFT
PHI-CFCF0.5 0
BVW 0.5 0
VGAS-CFCF0.5 0
VOIL-CFCF0.5 0
SW-CFCF1 0
VSHCFCF0 1
PHI-CFCF1 0
0 VSH
VSH PHI-
TVDSSFT
Lista Fm
North Sea MarlTop D1
GOC
Top D2A
Top D2B
MhM1A
M1b1M1b2M1b3
M1b4M1b5
M1b7
M1b8
M2
M3
OWC
M4
6950
7000
7050
7100
7150
7200
7250
7300
7350
6800
6900
7000
7100
7200
GRapi0 150
TVDSSFT7700 6700
LLDOHMM0.2 200
LLSOHMM0.2 200
MSFLOHMM0.2 200
TNPHCFCF0.6 0
DRHOG/C30.75 -0.25
RHOBG/C31.7 2.7
DTCO1US/F140 40
DEPTHFT
PHI-CFCF0.5 0
BVW 0.5 0
VGAS-CFCF0.5 0
VOIL-CFCF0.5 0
SW-CFCF1 0
VSHCFCF0 1
PHI-CFCF1 0
0 VSH
VSH PHI-
TVDSSFT
Lista Fm
North Sea MarlTop D1
GOC
Top D2A
Top D2B
MhM1A
M1b1M1b2M1b3
M1b4M1b5
M1b7
M1b8
M2
M3
OWC
M4
6950
7000
7050
7100
7150
7200
7250
7300
7350
6800
6900
7000
7100
7200
OPGAVE: My Own Little Oilfield 4
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OPGAVE: My Own Little Oilfield 5
Apply a known geometrical shape to the reservoir shape: The Spherical Cap
αh
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OPGAVE: My Own Little Oilfield 6
Gross Rock Volume is then the volume of a spherical cap with a height of h and a radius of α
h is estimated using the log from the well –
You then find α from the seismic profiles
Calculate GRV from this expression (expect a large number!):
GRV = 1/6·π·h·(3·α²+h²)
αh
0
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OPGAVE: My Own Little Oilfield 7
• Gross Rock Volume (GRV)
• Net to Gross (N/G)
• Porosity (Φ)
• Oil Saturation (Soil equal to 1 minus Water Saturation Sw)
• Oil Formation Volume Factor (FVF given as a value of 2)
STOIIP = GRV ∙ N/G ∙ Φ ∙ Soil / FVF
Calculate STOIIP using this expression(the unit at this stage is m3):
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OPGAVE: My Own Little Oilfield 8
Reserves = STOIIPmillion bbls ∙ RF
STOIIPmillion bbls= STOIIPm3 ∙ 6.29 / 1,000,000
We now re-calculate STOIIP in m3 to STOIIP in million bbls using this expression:
Finally the reserves are calculated given a recovery factor of 0.25 (25%):
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OPGAVE: My Own Little Oilfield 9 – Excel regneark til beregning
How can I learn more?How can I learn more?
http://www.maerskoil.comhttp://www.maerskoil.com
MÆRSK OLIE OG GAS AS
The End
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